23428

Appears in sequences

• Numbers that cannot be expressed as a sum of 2 triangular numbers and a power of 2.at n=3A112665
• n^3 - (n+2)^2.at n=29A153258
• Number of n X 5 0..2 arrays with horizontal differences mod 3 never 1, vertical differences mod 3 never -1, and rows and columns lexicographically nondecreasing.at n=7A229442
• Absolute discriminants of complex quadratic fields with 3-class rank 2.at n=29A242862
• Absolute discriminants of complex quadratic fields with 3-class group of elementary abelian type (3,3) of rank 2.at n=20A242863
• Absolute discriminants of complex quadratic fields with 3-class group of type (3,3), 3-principalization type (4443), IPAD [(3,3,3)^3, (3,9)], and Hilbert 3-class field tower of unknown length at least 3.at n=2A242873
• Absolute discriminants of complex quadratic fields with 3-class group of type (3,3) whose second 3-class group is located on the sporadic part of the coclass graph G(3,2) outside of coclass trees.at n=12A247691
• Numbers that are the sum of eight fourth powers in exactly nine ways.at n=29A345841